.\"	$OpenBSD: uuid.3,v 1.3 2014/08/31 20:34:28 jmc Exp $
.\"	$NetBSD: uuid.3,v 1.7 2008/05/02 18:11:05 martin Exp $
.\"
.\" Copyright (c) 2004 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jason R. Thorpe.
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.\" modification, are permitted provided that the following conditions
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.\" Copyright (c) 2002 Marcel Moolenaar
.\" Copyright (c) 2002 Hiten Mahesh Pandya
.\" All rights reserved.
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.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" $FreeBSD: src/lib/libc/uuid/uuid.3,v 1.4 2003/08/08 19:12:28 marcel Exp $
.\"
.Dd $Mdocdate: August 31 2014 $
.Dt UUID 3
.Os
.Sh NAME
.Nm uuid_compare , uuid_create , uuid_create_nil , uuid_equal ,
.Nm uuid_from_string , uuid_hash , uuid_is_nil , uuid_to_string ,
.Nm uuid_enc_le , uuid_dec_le , uuid_enc_be , uuid_dec_be
.Nd Universally Unique Identifier routines
.Sh SYNOPSIS
.In uuid.h
.Ft int32_t
.Fn uuid_compare "const uuid_t *uuid1" "const uuid_t *uuid2" "uint32_t *status"
.Ft void
.Fn uuid_create "uuid_t *uuid" "uint32_t *status"
.Ft void
.Fn uuid_create_nil "uuid_t *uuid" "uint32_t *status"
.Ft int32_t
.Fn uuid_equal "const uuid_t *uuid1" "const uuid_t *uuid2" "uint32_t *status"
.Ft void
.Fn uuid_from_string "const char *str" "uuid_t *uuid" "uint32_t *status"
.Ft uint16_t
.Fn uuid_hash "const uuid_t *uuid" "uint32_t *status"
.Ft int32_t
.Fn uuid_is_nil "const uuid_t *uuid" "uint32_t *status"
.Ft void
.Fn uuid_to_string "const uuid_t *uuid" "char **str" "uint32_t *status"
.Ft void
.Fn uuid_enc_le "void *buf" "const uuid_t *uuid"
.Ft void
.Fn uuid_dec_le "const void *buf" "uuid_t *"
.Ft void
.Fn uuid_enc_be "void *buf" "const uuid_t *uuid"
.Ft void
.Fn uuid_dec_be "const void *buf" "uuid_t *"
.Sh DESCRIPTION
These routines provide for the creation and manipulation of Universally
Unique Identifiers
.Pq UUIDs ,
also referred to as Globally Unique Identifiers
.Pq GUIDs .
.Pp
The
.Fn uuid_compare
function compares two UUIDs.
It returns \-1 if
.Fa uuid1
precedes
.Fa uuid2 ,
0 if they are equal, or 1 if
.Fa uuid1
follows
.Fa uuid2 .
.Pp
The
.Fn uuid_create
function creates a new UUID.
Storage for the new UUID must be pre-allocated by the caller.
.Pp
The
.Fn uuid_create_nil
function creates a nil-valued UUID.
Storage for the new UUID must be pre-allocated by the caller.
.Pp
The
.Fn uuid_equal
function compares two UUIDs to determine if they are equal.
It returns 1 if they are equal, and 0 if they are not equal.
.Pp
The
.Fn uuid_from_string
function parses a 36-character string representation of a UUID and
converts it to binary representation.
Storage for the UUID must be pre-allocated by the caller.
.Pp
The
.Fn uuid_hash
function generates a hash value for the specified UUID.
Note that the hash value is not a cryptographic hash, and should not be
assumed to be unique given two different UUIDs.
.Pp
The
.Fn uuid_is_nil
function returns 1 if the UUID is nil-valued and 0 if it is not.
.Pp
The
.Fn uuid_to_string
function converts a UUID from binary representation to string representation.
Storage for the string is dynamically allocated and returned via the
.Fa str
argument.
This pointer should be passed to
.Xr free 3
to release the allocated storage when it is no longer needed.
.Pp
The
.Fn uuid_enc_le
and
.Fn uuid_enc_be
functions encode a binary representation of a UUID into an octet stream
in little-endian and big-endian byte order, respectively.
The destination buffer must be pre-allocated by the caller, and must be
large enough to hold the 16-octet binary UUID.
.Pp
The
.Fn uuid_dec_le
and
.Fn uuid_dec_be
functions decode a UUID from an octet stream in little-endian and
big-endian byte order, respectively.
.Sh RETURN VALUES
The
.Fn uuid_compare ,
.Fn uuid_create ,
.Fn uuid_create_nil ,
.Fn uuid_equal ,
.Fn uuid_from_string ,
.Fn uuid_hash ,
.Fn uuid_is_nil ,
and
.Fn uuid_to_string
functions return successful or unsuccessful completion status in the
.Fa status
argument.
Possible values are:
.Bl -tag -width ".Dv uuid_s_invalid_string_uuid"
.It Dv uuid_s_ok
The function completed successfully.
.It Dv uuid_s_bad_version
The UUID does not have a known version.
.It Dv uuid_s_invalid_string_uuid
The string representation of a UUID is not valid.
.It Dv uuid_s_no_memory
Memory could not be allocated for the operation.
.El
.\" .Sh SEE ALSO
.\" .Xr uuidgen 1
.Sh STANDARDS
The
.Fn uuid_compare ,
.Fn uuid_create ,
.Fn uuid_create_nil ,
.Fn uuid_equal ,
.Fn uuid_from_string ,
.Fn uuid_hash ,
.Fn uuid_is_nil ,
and
.Fn uuid_to_string
functions are compatible with the DCE 1.1 RPC specification.
